US20110091596A1 - Two-shaft extruder - Google Patents
Two-shaft extruder Download PDFInfo
- Publication number
- US20110091596A1 US20110091596A1 US12/933,937 US93393708A US2011091596A1 US 20110091596 A1 US20110091596 A1 US 20110091596A1 US 93393708 A US93393708 A US 93393708A US 2011091596 A1 US2011091596 A1 US 2011091596A1
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- Prior art keywords
- abutment member
- pair
- phase difference
- projecting portions
- rotor
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- 230000002401 inhibitory effect Effects 0.000 claims description 6
- 230000003467 diminishing effect Effects 0.000 claims description 4
- 230000002265 prevention Effects 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 10
- 230000003247 decreasing effect Effects 0.000 description 9
- 238000004898 kneading Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 239000000314 lubricant Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000011345 viscous material Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- 238000003287 bathing Methods 0.000 description 2
- 239000011346 highly viscous material Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
- B29C48/402—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders the screws having intermeshing parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
- B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
- B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
- B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
- B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
- B29B7/484—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws with two shafts provided with screws, e.g. one screw being shorter than the other
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
- B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
- B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
- B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
- B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
- B29B7/488—Parts, e.g. casings, sealings; Accessories, e.g. flow controlling or throttling devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
- B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
- B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
- B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
- B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
- B29B7/488—Parts, e.g. casings, sealings; Accessories, e.g. flow controlling or throttling devices
- B29B7/489—Screws
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
- B29B7/58—Component parts, details or accessories; Auxiliary operations
- B29B7/60—Component parts, details or accessories; Auxiliary operations for feeding, e.g. end guides for the incoming material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
- B29B7/58—Component parts, details or accessories; Auxiliary operations
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- B29B7/728—Measuring data of the driving system, e.g. torque, speed, power, vibration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
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- B29C48/252—Drive or actuation means; Transmission means; Screw supporting means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/52—Screws with an outer diameter varying along the longitudinal axis, e.g. for obtaining different thread clearance
- B29C48/525—Conical screws
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
- B29B7/7476—Systems, i.e. flow charts or diagrams; Plants
- B29B7/7495—Systems, i.e. flow charts or diagrams; Plants for mixing rubber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C2948/9238—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/9239—Screw or gear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92952—Drive section, e.g. gearbox, motor or drive fluids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/252—Drive or actuation means; Transmission means; Screw supporting means
- B29C48/2522—Shaft or screw supports, e.g. bearings
Definitions
- the present invention relates to a two-shaft extruder comprising a pair of rotor shafts rotatably disposed with a distance therebetween diminishing toward the leading ends thereof, a screw blade mounted to the leading end of each one of the pair of rotor shafts, one screw blade intruding into the pitch of the other screw blade; and a drive unit mounted the base end of each one of the pair of rotor shafts for rotatably driving the rotor shaft associated therewith.
- Such two-shaft extruder is configured to be capable of extruding an amount of high-viscosity substance such a un-formed rubber material, plastic material charged therein while kneading the substance with the screw blades.
- a motor M with a reduction mechanism is mounted as a drive unit to the base end of one rotor shaft 1 a alone.
- a conical gear 15 is attached to each one of the pair of rotor shafts 1 .
- the motor M rotatably drives the one rotor shaft 1 a
- the other rotor shaft 1 b is rotated in association therewith through the meshing engagement between the pair of conical gears 15 .
- Patent Document 1 Japanese Patent Application “Kokai” No. Hei. 9-164578.
- both these extruders require that conical gears having complicated contours and requiring high working precision be provided on the pair of rotor shafts respectively; hence, there was room for improvement.
- the conical gear requires a gear box for oil bathing with lubricant oil because of the constant meshing between the gears, and provision of the gear box leads to need to provide separately a mechanism for preventing the lubricant oil of the gear box from entering the housing. In these ways, the constructions would tend to be complicated.
- the present invention has been made in view of the above-described state of the art and its object is to provide a two-shaft extruder having simple construction, yet capable of efficient and effective extrusion.
- a two-shaft extruder relating to the present invention comprises a pair of rotor shafts rotatably disposed with a distance therebetween diminishing toward the leading ends thereof, a screw blade mounted to the leading end of each one of the pair of rotor shafts, one screw blade intruding into the pitch of the other screw blade; and a drive unit mounted the base end of each one of the pair of rotor shafts for rotatably driving the rotor shaft associated therewith.
- a screw blade contact preventing mechanism configured to allow a predetermined phase difference between the pair of rotor shafts, while inhibiting a phase difference greater than the predetermined phase difference when the pair of rotor shafts are rotatably driven respectively.
- a screw blade contact preventing mechanism configured to allow a predetermined phase difference between the pair of rotor shafts, while inhibiting a phase difference greater than the predetermined phase difference when the pair of rotor shafts are rotatably driven respectively, it becomes possible to simplify the construction by e.g. omitting the conical gears. And, at the same time, with setting, as the predetermined phase difference, such an appropriate phase difference as to be capable of inhibiting inadvertent contact between the screw blades, efficient and effective extrusion is made possible with prevention of mutual contact between the screw blades.
- the gear box for lubricant oil bathing and the mechanism for preventing entrance of lubricant oil of the gear box into the housing can be omitted also, so that the construction can be further simplified.
- said screw blade contact preventing mechanism includes:
- a first abutment member comprised of a plurality of projecting portions formed in one rotor shaft along the peripheral direction thereof and equidistantly or substantially equidistantly from each other;
- a second abutment member comprised of a plurality of projecting portions formed in the other rotor shaft along the peripheral direction thereof and equidistantly or substantially equidistantly from each other;
- a path of the projecting portions of the first abutment member and a path of the projecting portions of the second abutment member are configured to interfere with each other;
- a gap for allowing the predetermined phase difference between the pair of rotor shafts, while inhibiting a phase difference greater than the predetermined phase difference.
- the first abutment member and the second abutment member can be provided by a simple work not requiring high precision, i.e. the work of providing a plurality of projecting portions in peripheral juxtaposition on each rotor shaft.
- phase difference is prevented between the pair of rotor shafts through the abutment between a projecting portion of the first abutment member and a projecting portion in the second abutment member peripherally opposed thereto, inadvertent contact or collision between the screw blades can be prevented, thus making effective and efficient extruding operation possible.
- a plurality of sets of the first abutment members and the second abutment members are provided along the longitudinal direction of each rotor shaft;
- the projecting portions of the first abutment member belonging in a certain set are made different in position peripherally as seen in the axial direction of the one rotor shaft than the projecting portions of the first abutment member belonging in another set adjacent thereto;
- the projecting portions of the second abutment member belonging in a certain set are made different in position peripherally as seen in the axial direction of the other rotor shaft than the projecting portions of the second abutment member belonging in another set adjacent thereto.
- the projecting portions of the first abutment member belonging in a certain set are made different in position peripherally as seen in the axial direction of the one rotor shaft than the projecting portions of the first abutment member belonging in another set adjacent thereto and the projecting portions of the second abutment member belonging in a certain set are made different in position peripherally as seen in the axial directing portion of the other rotor shaft than the projecting portions of the second abutment member belonging in another set adjacent thereto, even if a projecting portion of the first abutment member of a certain set inadvertently fails to abut the second abutment member of that set and bypasses it via the gap, the projecting portion of the first abutment member belonging in the adjacent set will abut the second abutment member in that set, thus preventing a phase difference greater than the pre
- the extruder further comprises:
- a rotational speed detecting means for detecting a rotational speed of each one of the first abutment member and the second abutment member
- a controlling means for calculating a cycle ratio between the cycle of the first abutment member and the cycle of the second abutment member from the rotational speeds detected by the rotational speed detecting means and also for executing synchronization control scheme for each one of the pair of drive units such that said cycle ratio becomes equal to 1 (one).
- a rotational speed detecting means for detecting a rotational speed of each one of the first abutment member and the second abutment member and a controlling means for calculating a cycle ratio between the cycle of the first abutment member and the cycle of the second abutment member from the rotational speeds detected by the rotational speed detecting means and also for executing synchronization control scheme for each one of the pair of drive units such that said cycle ratio becomes equal to 1 (one), in comparison with an alternative arrangement wherein a phase difference between the pair of rotor shafts is detected by a position detecting means such as a rotary encoder and the respective rotational speeds of the pair of rotor shafts are detected by a rotational speed detecting means such as a tachometer and synchronization control scheme is executed for each one of the drive units such that the phase difference between the pair of rotor shafts becomes equal to 0 (zero), the position detecting means can be omitted. Moreover, the synchronization control is made possible with the
- the extruder further comprises:
- phase difference generating commanding means for issuing a phase difference generating command
- said controlling means executes a phase difference generating control scheme for each one of the pair of drive units with priority over said synchronization control scheme such that the predetermined phase difference is generated between the pair of rotor shafts.
- phase difference generating commanding means for issuing a phase difference generating command and in response to input of the phase difference generating command to said phase difference generating commanding means, said controlling means executes a phase difference generating control scheme for each one of the pair of drive units with priority over said synchronization control scheme such that the predetermined phase difference is generated between the pair of rotor shafts, by causing the phase difference generating command by the phase difference generating commanding means, it is possible to positively cause the above-described enhanced kneading effect and the cleaning effect to be provided as needed.
- FIG. 1 is a general plane view of a two-shaft extruder according to a first embodiment
- FIG. 2 is a front view showing a first abutment member and a second abutment member in the first embodiment
- FIG. 3 is a view showing screw blades and rotor shafts
- FIG. 4 is a control block diagram
- FIG. 5 is a general plane view showing a two-shaft extruder according to a second embodiment
- FIG. 6 is a front view showing a set of a first abutment member and a second abutment member in the second embodiment
- FIG. 7 is a general plane view showing a two-shaft extruder according to a third embodiment
- FIG. 8 is a front view showing a set of a first abutment member and a second abutment member in the third embodiment
- FIG. 9 is a general plane view showing a two-shaft extruder having a conventional construction.
- a two-shaft extruder is for use in extruding an amount of high-viscosity substance such as un-formed rubber material, plastic material which has been kneaded by a kneading machine such as a mixer, a kneader, etc.
- the two-shaft extruder includes such components as a pair of rotor shafts 1 rotatably disposed with a distance therebetween diminishing toward the leading ends thereof, a pair of screw blades 2 mounted to the respective leading ends of the pair of rotor shafts 1 , a pair of motors M with reduction mechanism provided at the respective base ends of the pair of rotor shafts 1 as a pair of drive units for rotatably driving the rotor shafts 1 respectively, and so on.
- Each rotor shaft 1 has an approximately cylindrical shape with a tapered leading end.
- the screw blade 2 is configured as a variable pitch type having its pitch width P progressively decreasing toward the leading end and its flight height reducing toward the same.
- the other screw blade 2 b intrudes into the pitch P of one screw blade 2 a and the one screw blade 2 a intrudes into the pitch P of the other screw blade 2 b so that the peripheral edge of the screw blade 2 is disposed in close vicinity of the outer peripheral face of the rotor shaft 1 .
- a housing 3 is provided for accommodating therein the rotor shafts 1 and the screw blades 2 . And, an amount of high-viscous substance or material can be charged from above the housing 3 .
- an extruder main body 4 To the base end of this housing 3 , there is mounted an extruder main body 4 .
- the base ends of the rotor shafts 1 extend through the extruder main body 4 and bearings 5 are provided between base ends of the rotor shafts 1 and the extruder main body 4 , so that the extruder main body 4 rotatably supports the rotor shafts 1 .
- a first abutment member 6 and a second abutment member 7 At positions offset toward the base ends from the center portions of the rotor shafts 1 , there are mounted a first abutment member 6 and a second abutment member 7 to be described later.
- the first abutment member 6 and the second abutment member 7 are provided in an inner space 4 a of the extruder main body 4 .
- the first abutment member 6 is constituted of a plurality of projecting portions 6 a formed on one rotor shaft 1 a equidistantly in the peripheral direction.
- the second abutment member 7 is constituted of a plurality of projecting portions 7 a formed on the other rotor shaft 1 b equidistantly in the peripheral direction. And, arrangement is provided such that the path of the projecting portions 6 a of the first abutment member 6 and the path of the projecting portions 7 a of the second abutment member 7 interfere with each other.
- a gap (d) for allowing a predetermined phase difference between the pair of rotor shafts 1 , while preventing any phase difference greater than the predetermined phase difference.
- a screw blade contact preventing mechanism SS for allowing a predetermined phase difference between the pair of rotor shafts 1 , while preventing any phase difference greater than the predetermined phase difference, when the pair of rotor shafts 1 are rotatably driven respectively.
- the first abutment member 6 comprises four projecting portions 6 a formed peripherally equidistantly on a cylindrical boss portion 6 b attached to the one rotor shaft 1 a , each projecting portion 6 a having a rectangular plate-like shape with one corner removed therefrom.
- the second abutment member 7 comprises four projecting portions 7 a formed peripherally equidistantly on a cylindrical boss portion 7 b attached to the other rotor shaft 1 b , each projecting portion 7 a having a rectangular plate-like shape with one corner removed therefrom.
- distances P 1 , P 2 longitudinally of the respective rotor shaft 1 between the one screw blade 2 a and the other screw blade 2 b intruding into the pitch P of the one screw blade 2 a will vary, thereby to provide an enhanced kneading effect for providing enhanced kneading of an amount of high-viscous substance entrapped between these screw blades 2 and the cleaning effect of the peripheral edge of the screw blade 2 moving along the outer peripheral face of the rotor shaft 1 to remove or scrape off an amount of high-viscous substance adhering to this rotor shaft 1 .
- the predetermined phase difference between the pair of rotor shafts 1 is not limited to the 60 degrees phase difference described above, but may vary as desired and/or appropriately, in accordance with such factors as the torsion angle, the flight height of the screw blade 2 .
- the construction includes an unillustrated command switch as a phase difference generating commanding means for issuing a phase difference generating command, one proximity sensor 9 a disposed in close proximity of the projecting portion 6 a of the first abutment member 6 , one rotational speed determining section 10 a for determining a rotational speed of the first abutment member 6 based on detection information from the proximity sensor 9 a and an unillustrated timer, the other proximity sensor 9 b disposed in close proximity of the projecting portion 7 a of the second abutment member 7 , the other rotational speed determining section 10 b for determining a rotational speed of the second abutment member 7 based on detection information from the proximity sensor 9 b and an unillustrated timer.
- an unillustrated command switch as a phase difference generating commanding means for issuing a phase difference generating command
- one proximity sensor 9 a disposed in close proximity of the projecting portion 6 a of the first abutment member 6
- the construction further includes a calculating section 11 for calculating a cycle ratio Ta/Tb between a cycle Ta of the first abutment member 6 and a cycle Tb of the second abutment member 7 , based on the rotational speeds of the first and second abutment members 6 , 7 detected by the rotational speed determining sections 10 a , 10 b , respectively, one speed commanding section 12 a for issuing, to one motor Ma, a speed increasing/decreasing command for increasing/decreasing the rotational speed of this one motor Ma based on the cycle ratio Ta/Tb calculated by the calculating section 11 , and the other speed commanding section 12 b for issuing, to the other motor Mb, a speed increasing/decreasing command for increasing/decreasing the rotational speed of this other motor Mb based on the cycle ratio Ta/Tb calculated by the calculating section 11 .
- the controlling apparatus H calculates the cycle ratio Ta/Tb between the cycle Ta of the first abutment member 6 and the cycle Tb of the second abutment member 7 based on the rotational speeds detected by the rotational speed detecting means and also issues a speed increasing/decreasing command to the pair of motors M respectively so that the cycle ratio Ta/Tb may become 1 (one), thereby to execute a synchronization control scheme for driving the pair of motors M respectively.
- the controlling apparatus H issues a speed increasing/decreasing command to the pair of motors M respectively so as to execute a phase difference generating control scheme in such a manner as to generate the predetermined phase difference between the pair of rotor shafts 1 , with priority over the synchronization control scheme described above. Therefore, under the normal condition, the pair of motors M are synchronized with each other and as a worker, monitoring the conditions of the rotor shafts 1 and/or the screw blades 2 , will operate the commanding switch to issue the phase difference generating command, so that an enhanced kneading effect and/or cleaning effect can be provided as needed or desired.
- the first abutment member 6 will be rotated by 1 ⁇ 4 rotation and the one proximity sensor 9 a detects the cycle (0.25 Ta) of the first abutment member 6 .
- the second abutment member 7 is rotated by 1 ⁇ 4 rotation and the other proximity sensor 9 b detects the cycle (0.25 Tb) of the second abutment member 7 .
- the controlling apparatus will calculate the cycle ratio Ta/Tb between the cycle (0.25Ta) in the case of the 1 ⁇ 4 rotation of the first abutment member 6 and the cycle (0.25 Tb) in the case of the 1 ⁇ 4 rotation of the second abutment member 7 .
- this cycle ratio Ta/Tb is smaller than 1, that is, the phase of the first abutment member 6 has advanced at the time of the 1 ⁇ 4 rotations of the first abutment member 6 and the second abutment member 7 .
- speed increasing/decreasing commands will be issued respectively to the pair of motors M so that the cycle ratio Ta/Tb between the cycle (0.5 Ta) at the time of 1 ⁇ 2 rotation of the first abutment member 6 and the cycle (0.5 Tb) at the time of 1 ⁇ 2 rotation of the second abutment member 7 may become 1 (one).
- the speed increasing/decreasing commands are issued to the respective motors M so as to generate the predetermined phase difference between the pair of rotor shafts 1 .
- two sets of the first abutment members 6 and the second abutment members 7 are provided along the longitudinal direction of each rotor shaft 1 (that is, the direction along the bisector dividing the internal angle formed between the pair of rotor shafts 1 into two equal angles). And, the positions of projecting portions 6 a 1 of the first abutment member 6 belonging to the base end side set (outline portions in FIG. 6 ) and the positions of projecting portions 6 a 2 of the first abutment member 6 belonging to the leading end side set (shaded line portions in FIG. 6 ) adjacent to the base end side set are rendered different from each other in the peripheral direction as seen along the axis of the one rotor shaft.
- the positions of projecting portions 7 a 1 of the second abutment member 7 belonging to the base end side set and the positions of projecting portions 7 a 2 of the second abutment member 7 belonging to the leading end side set adjacent to the base end side set are rendered different from each other in the peripheral direction as seen along the axis of the other rotor shaft.
- the first abutment member 6 belonging to the base end side set comprise four trapezoidal-shaped projecting portions 6 a 1 peripherally equidistantly disposed on a cylindrical boss portion 6 b 1 mounted on the one rotor shaft 1 a .
- the first abutment member 6 belonging to leading end side set comprise four trapezoidal-shaped projecting portions 6 a 2 peripherally equidistantly disposed on a cylindrical boss portion 6 b 2 mounted on the one rotor shaft 1 a .
- the second abutment member 7 belonging to the base end side set comprise four trapezoidal-shaped projecting portions 7 a 1 peripherally equidistantly disposed on a cylindrical boss portion 7 b 1 mounted on the other rotor shaft 1 b .
- the second abutment member 7 belonging to the leading end side set comprise four trapezoidal-shaped projecting portions 7 a 2 peripherally equidistantly disposed on a cylindrical boss portion 7 b 2 mounted on the other rotor shaft 1
- the first abutment member 6 belonging to the base end side set and the first abutment member 6 belong to the leading end side set are disposed with a phase difference of 45 degrees between these first abutment members 6 as seen along the axial direction of the one rotor shaft.
- the second abutment member 7 belonging to the base end side set and the second abutment member 7 belong to the leading end side set are disposed with a phase difference of 45 degrees between these second abutment members 7 as seen along the axial direction of the other rotor shaft.
- the phase difference to be provided between the first abutment members 6 or between the second abutment members 7 is not limited to the 45 degree phase difference described above. However, such angle (45 degrees) is preferred in view of reliably preventing a phase difference (e.g. about 60 degrees) greater than the predetermined phase difference between the pair of rotor shafts.
- three sets of the first abutment members 6 and the second abutment members 7 are provided along the longitudinal direction of each rotor shaft 1 .
- the positions of projecting portions 7 a 1 of the second abutment member 7 belonging to the base end side set and the positions of projecting portions 7 a 2 of the second abutment member 7 belonging to the intermediate side set adjacent to the base end side set and the positions of the projecting portions 7 a 3 of the second abutment member 7 belonging to the leading end side set adjacent to the intermediate side set are rendered different from each other in the peripheral direction as seen along the axis of the other rotor shaft.
- the first abutment member 6 belonging to the base end side set comprise three trapezoidal-shaped projecting portions 6 a 1 peripherally equidistantly disposed on a cylindrical boss portion 6 b 1 mounted on the one rotor shaft 1 a .
- the first abutment member 6 belonging to the intermediate side set comprise three trapezoidal-shaped projecting portions 6 a 2 peripherally equidistantly disposed on a cylindrical boss portion 6 b 2 mounted on the one rotor shaft 1 a .
- the first abutment member 6 belonging to the leading end side set comprise three trapezoidal-shaped projecting portions 6 a 3 peripherally equidistantly disposed on a cylindrical boss portion 6 b 3 mounted on the one rotor shaft 1 a .
- the second abutment member 7 belonging to the base end side set comprise three trapezoidal-shaped projecting portions 7 a 1 peripherally equidistantly disposed on a cylindrical boss portion 7 b 1 mounted on the other rotor shaft 1 b .
- the second abutment member 7 belonging to the intermediate side set comprise three trapezoidal-shaped projecting portions 7 a 2 peripherally equidistantly disposed on a cylindrical boss portion 7 b 2 mounted on the other rotor shaft 1 b .
- the second abutment member 7 belonging to the leading end side set comprise three trapezoidal-shaped projecting portions 7 a 3 peripherally equidistantly disposed on a cylindrical boss portion 7 b 3 mounted on the other rotor shaft 1 b.
- first abutment member 6 belonging to the base end side set and the first abutment member 6 belong to the intermediate side set and the first abutment member 6 belong to the leading end side set are disposed with a phase difference of 40 degrees between these first abutment members 6 as seen along the axial direction of the one rotor shaft.
- second abutment member 7 belonging to the base end side set and the second abutment member 7 belonging to the intermediate side set and the second abutment member 7 belong to the leading end side set are disposed with a phase difference of 40 degrees between these second abutment members 7 as seen along the axial direction of the other rotor shaft.
- the number of the sets of the first abutment members 6 and the second abutment members 7 is not limited to 2 or 3 , but may be more. In such case, an arrangement will be made such that the first abutment member 6 of each one of the plurality of sets is disposed with an offset in phase as seen in the direction of the one rotor shaft axis by an angle obtained by dividing the angle formed between its projecting portions 6 a peripherally adjacent each other by the number of the sets of the first abutment members 6 .
- one proximity sensor 9 a detects the projecting portion 6 a of the first abutment member 6 and the other proximity sensor 9 b detects the projecting portion 7 a of the second abutment member 7 .
- one proximity sensor 9 a may detect the projecting portion 6 a of the first abutment member 6 whereas the other proximity sensor 9 b detects a dog (a detection target element) provided in the second abutment member 7 . With this arrangement, it becomes possible to match the detection timings of the proximity sensors 9 a , 9 b each other.
- the projecting portion 6 a of the first abutment member 6 and the projecting portion 7 a of the second abutment member 7 are formed like a rectangular plate with a corner thereof removed or in the trapezoidal form.
- the invention is not limited thereto. Instead, these projecting portions may be provided in the form of a triangle shape having straight lateral sides or a tapered shape having lateral sides thereof comprised of curves such as involutes, etc.
- the present invention is useful as a two-shaft extruder having simple construction, yet capable of efficient and effective extrusion.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
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- Mixers Of The Rotary Stirring Type (AREA)
Abstract
Description
- The present invention relates to a two-shaft extruder comprising a pair of rotor shafts rotatably disposed with a distance therebetween diminishing toward the leading ends thereof, a screw blade mounted to the leading end of each one of the pair of rotor shafts, one screw blade intruding into the pitch of the other screw blade; and a drive unit mounted the base end of each one of the pair of rotor shafts for rotatably driving the rotor shaft associated therewith.
- Such two-shaft extruder is configured to be capable of extruding an amount of high-viscosity substance such a un-formed rubber material, plastic material charged therein while kneading the substance with the screw blades.
- Conventionally, with a two-shaft extruder, in general, as shown in
FIG. 9 , a motor M with a reduction mechanism is mounted as a drive unit to the base end of onerotor shaft 1 a alone. Whereas, aconical gear 15 is attached to each one of the pair ofrotor shafts 1. In operation, as the motor M rotatably drives the onerotor shaft 1 a, theother rotor shaft 1 b is rotated in association therewith through the meshing engagement between the pair ofconical gears 15. In contrast, there has been proposed a different type designed to allow use of more inexpensive conical gears through reduction of the load applied to the pair ofconical gears 15 for transmitting the rotational drive force, in which a drive unit for rotatably driving a rotor shaft is mounted to the base end of each one of the pair of rotor shafts and a pair of conical gears are provided to the pair of rotor shafts respectively, such that the pair of drive units drive the pair of rotor shafts respectively in synchronism with each other through meshing engagement between the conical gears while avoiding contact between the screw blades of the rotor shafts (see e.g. Patent Document 1). -
Patent Document 1; Japanese Patent Application “Kokai” No. Hei. 9-164578. - With the conventional two-shaft extruders, although differing in one transmitting drive force of one rotor shaft to the other rotor shaft, the other synchronizing each one of the pair of rotor shafts, both these extruders require that conical gears having complicated contours and requiring high working precision be provided on the pair of rotor shafts respectively; hence, there was room for improvement.
- Further, the conical gear requires a gear box for oil bathing with lubricant oil because of the constant meshing between the gears, and provision of the gear box leads to need to provide separately a mechanism for preventing the lubricant oil of the gear box from entering the housing. In these ways, the constructions would tend to be complicated.
- The present invention has been made in view of the above-described state of the art and its object is to provide a two-shaft extruder having simple construction, yet capable of efficient and effective extrusion.
- A two-shaft extruder relating to the present invention comprises a pair of rotor shafts rotatably disposed with a distance therebetween diminishing toward the leading ends thereof, a screw blade mounted to the leading end of each one of the pair of rotor shafts, one screw blade intruding into the pitch of the other screw blade; and a drive unit mounted the base end of each one of the pair of rotor shafts for rotatably driving the rotor shaft associated therewith. According to the first characterizing feature, there is provided a screw blade contact preventing mechanism configured to allow a predetermined phase difference between the pair of rotor shafts, while inhibiting a phase difference greater than the predetermined phase difference when the pair of rotor shafts are rotatably driven respectively.
- That is, since there is provided a screw blade contact preventing mechanism configured to allow a predetermined phase difference between the pair of rotor shafts, while inhibiting a phase difference greater than the predetermined phase difference when the pair of rotor shafts are rotatably driven respectively, it becomes possible to simplify the construction by e.g. omitting the conical gears. And, at the same time, with setting, as the predetermined phase difference, such an appropriate phase difference as to be capable of inhibiting inadvertent contact between the screw blades, efficient and effective extrusion is made possible with prevention of mutual contact between the screw blades.
- Further, due to the possibility of omitting the conical gears, the gear box for lubricant oil bathing and the mechanism for preventing entrance of lubricant oil of the gear box into the housing can be omitted also, so that the construction can be further simplified.
- According to the second characterizing feature of the present invention, in addition to the first characterizing feature described above, said screw blade contact preventing mechanism includes:
- a first abutment member comprised of a plurality of projecting portions formed in one rotor shaft along the peripheral direction thereof and equidistantly or substantially equidistantly from each other; and
- a second abutment member comprised of a plurality of projecting portions formed in the other rotor shaft along the peripheral direction thereof and equidistantly or substantially equidistantly from each other;
- a path of the projecting portions of the first abutment member and a path of the projecting portions of the second abutment member are configured to interfere with each other; and
- between a projecting portion of the first abutment member and a projecting portion of the second abutment member peripherally opposed thereto, there is provided a gap for allowing the predetermined phase difference between the pair of rotor shafts, while inhibiting a phase difference greater than the predetermined phase difference.
- That is, since a gap is provided between a projecting portion of the first abutment member and a projecting portion of the second abutment member peripherally opposed thereto, no meshing engagement occurs between the projecting portion of the first abutment member and the projecting portion of the second abutment member peripherally opposed thereto. Hence, the first abutment member and the second abutment member can be provided by a simple work not requiring high precision, i.e. the work of providing a plurality of projecting portions in peripheral juxtaposition on each rotor shaft.
- Moreover, since a greater than predetermined amount phase difference is prevented between the pair of rotor shafts through the abutment between a projecting portion of the first abutment member and a projecting portion in the second abutment member peripherally opposed thereto, inadvertent contact or collision between the screw blades can be prevented, thus making effective and efficient extruding operation possible.
- In addition, as the projecting portion of the first abutment member moves within the gap provided between this projecting portion and the peripherally opposed projecting portion of the second abutment member, the predetermined phase difference between the pair of rotor shafts is allowed. Therefore, the distance in the longitudinal direction of each rotor shaft between one screw blade and the other screw blade intruding into the pitch of the one screw blade varies. With this arrangement, there can be expected achievement of such advantageous effects as enhanced kneading effect for further kneading an amount of highly viscous substance entrapped between these screw blades, a cleaning effect of removing any amount of highly viscous substance adhering to the rotor shaft by the peripheral edge of the screw blade moving along the rotor shaft.
- According to the third characterizing feature of the present invention, in addition to the second characterizing feature described above, a plurality of sets of the first abutment members and the second abutment members are provided along the longitudinal direction of each rotor shaft;
- the projecting portions of the first abutment member belonging in a certain set are made different in position peripherally as seen in the axial direction of the one rotor shaft than the projecting portions of the first abutment member belonging in another set adjacent thereto; and
- the projecting portions of the second abutment member belonging in a certain set are made different in position peripherally as seen in the axial direction of the other rotor shaft than the projecting portions of the second abutment member belonging in another set adjacent thereto.
- That is, since a plurality of sets of the first abutment members and the second abutment members are provided along the longitudinal direction of each rotor shaft, the projecting portions of the first abutment member belonging in a certain set are made different in position peripherally as seen in the axial direction of the one rotor shaft than the projecting portions of the first abutment member belonging in another set adjacent thereto and the projecting portions of the second abutment member belonging in a certain set are made different in position peripherally as seen in the axial directing portion of the other rotor shaft than the projecting portions of the second abutment member belonging in another set adjacent thereto, even if a projecting portion of the first abutment member of a certain set inadvertently fails to abut the second abutment member of that set and bypasses it via the gap, the projecting portion of the first abutment member belonging in the adjacent set will abut the second abutment member in that set, thus preventing a phase difference greater than the predetermined phase difference between the pair of rotor shafts, thus reliably preventing the phase difference between the pair of rotor shafts from becoming greater than the predetermined phase difference.
- According to the fourth characterizing feature of the present invention, in addition to the second or third characterizing feature described above, the extruder further comprises:
- a rotational speed detecting means for detecting a rotational speed of each one of the first abutment member and the second abutment member; and
- a controlling means for calculating a cycle ratio between the cycle of the first abutment member and the cycle of the second abutment member from the rotational speeds detected by the rotational speed detecting means and also for executing synchronization control scheme for each one of the pair of drive units such that said cycle ratio becomes equal to 1 (one).
- That is, since there are provided a rotational speed detecting means for detecting a rotational speed of each one of the first abutment member and the second abutment member and a controlling means for calculating a cycle ratio between the cycle of the first abutment member and the cycle of the second abutment member from the rotational speeds detected by the rotational speed detecting means and also for executing synchronization control scheme for each one of the pair of drive units such that said cycle ratio becomes equal to 1 (one), in comparison with an alternative arrangement wherein a phase difference between the pair of rotor shafts is detected by a position detecting means such as a rotary encoder and the respective rotational speeds of the pair of rotor shafts are detected by a rotational speed detecting means such as a tachometer and synchronization control scheme is executed for each one of the drive units such that the phase difference between the pair of rotor shafts becomes equal to 0 (zero), the position detecting means can be omitted. Moreover, the synchronization control is made possible with the simple control scheme of calculating the cycle ratio between the cycle of the first abutment member and the cycle of the second abutment member and rendering this cycle ratio 1 (one).
- According to the fifth characterizing feature of the present invention, in addition to the fourth characterizing feature described above, the extruder further comprises:
- a phase difference generating commanding means for issuing a phase difference generating command; and
- wherein in response to input of the phase difference generating command to said phase difference generating commanding means, said controlling means executes a phase difference generating control scheme for each one of the pair of drive units with priority over said synchronization control scheme such that the predetermined phase difference is generated between the pair of rotor shafts.
- Since there is provided a phase difference generating commanding means for issuing a phase difference generating command and in response to input of the phase difference generating command to said phase difference generating commanding means, said controlling means executes a phase difference generating control scheme for each one of the pair of drive units with priority over said synchronization control scheme such that the predetermined phase difference is generated between the pair of rotor shafts, by causing the phase difference generating command by the phase difference generating commanding means, it is possible to positively cause the above-described enhanced kneading effect and the cleaning effect to be provided as needed.
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FIG. 1 is a general plane view of a two-shaft extruder according to a first embodiment, -
FIG. 2 is a front view showing a first abutment member and a second abutment member in the first embodiment, -
FIG. 3 is a view showing screw blades and rotor shafts, -
FIG. 4 is a control block diagram, -
FIG. 5 is a general plane view showing a two-shaft extruder according to a second embodiment, -
FIG. 6 is a front view showing a set of a first abutment member and a second abutment member in the second embodiment, -
FIG. 7 is a general plane view showing a two-shaft extruder according to a third embodiment, -
FIG. 8 is a front view showing a set of a first abutment member and a second abutment member in the third embodiment, and -
FIG. 9 is a general plane view showing a two-shaft extruder having a conventional construction. - Next, a two-shaft extruder relating to the present invention will be described.
- As shown in
FIG. 1 andFIG. 2 , a two-shaft extruder is for use in extruding an amount of high-viscosity substance such as un-formed rubber material, plastic material which has been kneaded by a kneading machine such as a mixer, a kneader, etc. The two-shaft extruder includes such components as a pair ofrotor shafts 1 rotatably disposed with a distance therebetween diminishing toward the leading ends thereof, a pair ofscrew blades 2 mounted to the respective leading ends of the pair ofrotor shafts 1, a pair of motors M with reduction mechanism provided at the respective base ends of the pair ofrotor shafts 1 as a pair of drive units for rotatably driving therotor shafts 1 respectively, and so on. - Each
rotor shaft 1 has an approximately cylindrical shape with a tapered leading end. Thescrew blade 2 is configured as a variable pitch type having its pitch width P progressively decreasing toward the leading end and its flight height reducing toward the same. Between the pairedrotor shafts 1, theother screw blade 2 b intrudes into the pitch P of onescrew blade 2 a and the onescrew blade 2 a intrudes into the pitch P of theother screw blade 2 b so that the peripheral edge of thescrew blade 2 is disposed in close vicinity of the outer peripheral face of therotor shaft 1. Ahousing 3 is provided for accommodating therein therotor shafts 1 and thescrew blades 2. And, an amount of high-viscous substance or material can be charged from above thehousing 3. To the base end of thishousing 3, there is mounted an extrudermain body 4. The base ends of therotor shafts 1 extend through the extrudermain body 4 andbearings 5 are provided between base ends of therotor shafts 1 and the extrudermain body 4, so that the extrudermain body 4 rotatably supports therotor shafts 1. And, at positions offset toward the base ends from the center portions of therotor shafts 1, there are mounted afirst abutment member 6 and asecond abutment member 7 to be described later. - The
first abutment member 6 and thesecond abutment member 7 are provided in aninner space 4 a of the extrudermain body 4. Thefirst abutment member 6 is constituted of a plurality of projectingportions 6 a formed on onerotor shaft 1 a equidistantly in the peripheral direction. Thesecond abutment member 7 is constituted of a plurality of projectingportions 7 a formed on theother rotor shaft 1 b equidistantly in the peripheral direction. And, arrangement is provided such that the path of the projectingportions 6 a of thefirst abutment member 6 and the path of the projectingportions 7 a of thesecond abutment member 7 interfere with each other. Between a projectingportion 6 a of thefirst abutment member 6 and a projectingportion 7 a of thesecond abutment member 7 peripherally opposed thereto, there is provided a gap (d) for allowing a predetermined phase difference between the pair ofrotor shafts 1, while preventing any phase difference greater than the predetermined phase difference. These together constitute a screw blade contact preventing mechanism SS for allowing a predetermined phase difference between the pair ofrotor shafts 1, while preventing any phase difference greater than the predetermined phase difference, when the pair ofrotor shafts 1 are rotatably driven respectively. - Referring more particularly, the
first abutment member 6 comprises four projectingportions 6 a formed peripherally equidistantly on acylindrical boss portion 6 b attached to the onerotor shaft 1 a, each projectingportion 6 a having a rectangular plate-like shape with one corner removed therefrom. Similarly, thesecond abutment member 7 comprises four projectingportions 7 a formed peripherally equidistantly on acylindrical boss portion 7 b attached to theother rotor shaft 1 b, each projectingportion 7 a having a rectangular plate-like shape with one corner removed therefrom. - And, as shown in
FIG. 1 ,FIG. 2 andFIG. 3 , if the other rotor shaft lb is rotated forwardly while the onerotor shaft 1 a is stopped in its rotation thereby to provide a phase difference of 60-degree advanced (seeFIG. 3 (b)) from the normal phase (seeFIG. 3 (a)) between the pair ofrotor shafts 1, the projectingportion 7 a of thesecond abutment member 7 mounted on theother rotor shaft 1 b is moved in the gap (d) provided between this projectingportion 7 a and the projectingportion 6 a of thefirst abutment member 6 peripherally opposed thereto, thereby allowing a predetermined phase difference between these pairedrotor shafts 1. Therefore, distances P1, P2 longitudinally of therespective rotor shaft 1 between the onescrew blade 2 a and theother screw blade 2 b intruding into the pitch P of the onescrew blade 2 a will vary, thereby to provide an enhanced kneading effect for providing enhanced kneading of an amount of high-viscous substance entrapped between thesescrew blades 2 and the cleaning effect of the peripheral edge of thescrew blade 2 moving along the outer peripheral face of therotor shaft 1 to remove or scrape off an amount of high-viscous substance adhering to thisrotor shaft 1. At the same time, as the projectingportion 7 a of thesecond abutment member 7 comes into abutment against the projectingportion 6 a of thefirst abutment member 6 peripherally opposed thereto, thereby to prevent any phase difference greater than the predetermined phase difference between the pair ofrotor shafts 1. Therefore, inadvertent contact or collision between thescrew blade 2 can be effectively prevented and the extrusion operation can proceed in a smooth and effective manner. Incidentally, though not discussed in details, similar effects can be expected to be obtained also when theother rotor shaft 1 b is rotated in reverse while the onerotor shaft 1 a is stopped in its rotation, thus providing a phase difference of 60 degrees lagged from the normal phase (seeFIG. 3 (a)) between the pair of rotor shafts 1 (seeFIG. 3 (c)). - It should be noted here that the predetermined phase difference between the pair of
rotor shafts 1 is not limited to the 60 degrees phase difference described above, but may vary as desired and/or appropriately, in accordance with such factors as the torsion angle, the flight height of thescrew blade 2. - Next, a control construction of the two-shaft extruder will be explained additionally.
- As shown in
FIG. 4 , the construction includes an unillustrated command switch as a phase difference generating commanding means for issuing a phase difference generating command, oneproximity sensor 9 a disposed in close proximity of the projectingportion 6 a of thefirst abutment member 6, one rotationalspeed determining section 10 a for determining a rotational speed of thefirst abutment member 6 based on detection information from theproximity sensor 9 a and an unillustrated timer, theother proximity sensor 9 b disposed in close proximity of the projectingportion 7 a of thesecond abutment member 7, the other rotational speed determining section 10 b for determining a rotational speed of thesecond abutment member 7 based on detection information from theproximity sensor 9 b and an unillustrated timer. The construction further includes a calculatingsection 11 for calculating a cycle ratio Ta/Tb between a cycle Ta of thefirst abutment member 6 and a cycle Tb of thesecond abutment member 7, based on the rotational speeds of the first andsecond abutment members speed determining sections 10 a, 10 b, respectively, onespeed commanding section 12 a for issuing, to one motor Ma, a speed increasing/decreasing command for increasing/decreasing the rotational speed of this one motor Ma based on the cycle ratio Ta/Tb calculated by the calculatingsection 11, and the otherspeed commanding section 12 b for issuing, to the other motor Mb, a speed increasing/decreasing command for increasing/decreasing the rotational speed of this other motor Mb based on the cycle ratio Ta/Tb calculated by the calculatingsection 11. - Therefore, the
proximity sensors speed determining sections 10 a, 10 b together constitute “a rotational speed detecting means” for detecting rotational speeds of thefirst abutment member 6 and thesecond abutment member 7. The rotationalspeed determining sections 10 a, 10 b, the calculatingsection 11, and thespeed commanding sections proximity sensors - And, when no phase difference generating command is inputted thereto by the commanding switch, the controlling apparatus H calculates the cycle ratio Ta/Tb between the cycle Ta of the
first abutment member 6 and the cycle Tb of thesecond abutment member 7 based on the rotational speeds detected by the rotational speed detecting means and also issues a speed increasing/decreasing command to the pair of motors M respectively so that the cycle ratio Ta/Tb may become 1 (one), thereby to execute a synchronization control scheme for driving the pair of motors M respectively. Whereas, if a phase difference generating command is inputted thereto by the commanding switch, the controlling apparatus H issues a speed increasing/decreasing command to the pair of motors M respectively so as to execute a phase difference generating control scheme in such a manner as to generate the predetermined phase difference between the pair ofrotor shafts 1, with priority over the synchronization control scheme described above. Therefore, under the normal condition, the pair of motors M are synchronized with each other and as a worker, monitoring the conditions of therotor shafts 1 and/or thescrew blades 2, will operate the commanding switch to issue the phase difference generating command, so that an enhanced kneading effect and/or cleaning effect can be provided as needed or desired. - Referring more specifically, in the absence of input of the phase difference generating command by the commanding switch, for instance, the
first abutment member 6 will be rotated by ¼ rotation and the oneproximity sensor 9 a detects the cycle (0.25 Ta) of thefirst abutment member 6. When thesecond abutment member 7 is rotated by ¼ rotation and theother proximity sensor 9 b detects the cycle (0.25 Tb) of thesecond abutment member 7. The controlling apparatus will calculate the cycle ratio Ta/Tb between the cycle (0.25Ta) in the case of the ¼ rotation of thefirst abutment member 6 and the cycle (0.25 Tb) in the case of the ¼ rotation of thesecond abutment member 7. Then, if this cycle ratio Ta/Tb is smaller than 1, that is, the phase of thefirst abutment member 6 has advanced at the time of the ¼ rotations of thefirst abutment member 6 and thesecond abutment member 7, speed increasing/decreasing commands will be issued respectively to the pair of motors M so that the cycle ratio Ta/Tb between the cycle (0.5 Ta) at the time of ½ rotation of thefirst abutment member 6 and the cycle (0.5 Tb) at the time of ½ rotation of thesecond abutment member 7 may become 1 (one). When a phase difference generating command is issued by the commanding switch, the speed increasing/decreasing commands are issued to the respective motors M so as to generate the predetermined phase difference between the pair ofrotor shafts 1. - In this embodiment, only differences thereof from the first embodiment will be discussed, with discussion of the identical parts and arrangements to those in the first embodiment being omitted.
- Next, there will be described a screw blade contact preventing mechanism SS relating to the present invention.
- As shown in
FIG. 5 andFIG. 6 , two sets of thefirst abutment members 6 and thesecond abutment members 7 are provided along the longitudinal direction of each rotor shaft 1 (that is, the direction along the bisector dividing the internal angle formed between the pair ofrotor shafts 1 into two equal angles). And, the positions of projectingportions 6 a 1 of thefirst abutment member 6 belonging to the base end side set (outline portions inFIG. 6 ) and the positions of projectingportions 6 a 2 of thefirst abutment member 6 belonging to the leading end side set (shaded line portions inFIG. 6 ) adjacent to the base end side set are rendered different from each other in the peripheral direction as seen along the axis of the one rotor shaft. Similarly, the positions of projectingportions 7 a 1 of thesecond abutment member 7 belonging to the base end side set and the positions of projectingportions 7 a 2 of thesecond abutment member 7 belonging to the leading end side set adjacent to the base end side set are rendered different from each other in the peripheral direction as seen along the axis of the other rotor shaft. - More particularly, the
first abutment member 6 belonging to the base end side set comprise four trapezoidal-shaped projectingportions 6 a 1 peripherally equidistantly disposed on acylindrical boss portion 6b 1 mounted on the onerotor shaft 1 a. Thefirst abutment member 6 belonging to leading end side set comprise four trapezoidal-shaped projectingportions 6 a 2 peripherally equidistantly disposed on acylindrical boss portion 6b 2 mounted on the onerotor shaft 1 a. Thesecond abutment member 7 belonging to the base end side set comprise four trapezoidal-shaped projectingportions 7 a 1 peripherally equidistantly disposed on acylindrical boss portion 7b 1 mounted on theother rotor shaft 1 b. Thesecond abutment member 7 belonging to the leading end side set comprise four trapezoidal-shaped projectingportions 7 a 2 peripherally equidistantly disposed on acylindrical boss portion 7b 2 mounted on theother rotor shaft 1 b. - And, the
first abutment member 6 belonging to the base end side set and thefirst abutment member 6 belong to the leading end side set are disposed with a phase difference of 45 degrees between thesefirst abutment members 6 as seen along the axial direction of the one rotor shaft. And, thesecond abutment member 7 belonging to the base end side set and thesecond abutment member 7 belong to the leading end side set are disposed with a phase difference of 45 degrees between thesesecond abutment members 7 as seen along the axial direction of the other rotor shaft. Incidentally, the phase difference to be provided between thefirst abutment members 6 or between thesecond abutment members 7 is not limited to the 45 degree phase difference described above. However, such angle (45 degrees) is preferred in view of reliably preventing a phase difference (e.g. about 60 degrees) greater than the predetermined phase difference between the pair of rotor shafts. - In this embodiment, only differences thereof from the first embodiment will be discussed, with discussion of the identical parts and arrangements to those in the first embodiment being omitted.
- Next, there will be described a screw blade contact preventing mechanism SS relating to the present invention.
- As shown in
FIG. 7 andFIG. 8 , three sets of thefirst abutment members 6 and thesecond abutment members 7 are provided along the longitudinal direction of eachrotor shaft 1. And, the positions of projectingportions 6 a 1 of thefirst abutment member 6 belonging to the base end side set (outline portions inFIG. 8 ) and the positions of projectingportions 6 a 2 of thefirst abutment member 6 belonging to the intermediate side set (shaded portions inFIG. 8 ) adjacent to the base end side set and the positions of projectingportions 6 a 3 of thefirst abutment member 6 belonging to the leading end side set (meshed portions inFIG. 8 ) adjacent to the intermediate side set are rendered different from each other in the peripheral direction as seen along the axis of the one rotor shaft. Similarly, the positions of projectingportions 7 a 1 of thesecond abutment member 7 belonging to the base end side set and the positions of projectingportions 7 a 2 of thesecond abutment member 7 belonging to the intermediate side set adjacent to the base end side set and the positions of the projectingportions 7 a 3 of thesecond abutment member 7 belonging to the leading end side set adjacent to the intermediate side set are rendered different from each other in the peripheral direction as seen along the axis of the other rotor shaft. - More particularly, the
first abutment member 6 belonging to the base end side set comprise three trapezoidal-shaped projectingportions 6 a 1 peripherally equidistantly disposed on acylindrical boss portion 6b 1 mounted on the onerotor shaft 1 a. Thefirst abutment member 6 belonging to the intermediate side set comprise three trapezoidal-shaped projectingportions 6 a 2 peripherally equidistantly disposed on acylindrical boss portion 6b 2 mounted on the onerotor shaft 1 a. Thefirst abutment member 6 belonging to the leading end side set comprise three trapezoidal-shaped projectingportions 6 a 3 peripherally equidistantly disposed on acylindrical boss portion 6b 3 mounted on the onerotor shaft 1 a. Thesecond abutment member 7 belonging to the base end side set comprise three trapezoidal-shaped projectingportions 7 a 1 peripherally equidistantly disposed on acylindrical boss portion 7b 1 mounted on theother rotor shaft 1 b. Thesecond abutment member 7 belonging to the intermediate side set comprise three trapezoidal-shaped projectingportions 7 a 2 peripherally equidistantly disposed on acylindrical boss portion 7b 2 mounted on theother rotor shaft 1 b. Thesecond abutment member 7 belonging to the leading end side set comprise three trapezoidal-shaped projectingportions 7 a 3 peripherally equidistantly disposed on acylindrical boss portion 7b 3 mounted on theother rotor shaft 1 b. - And, the
first abutment member 6 belonging to the base end side set and thefirst abutment member 6 belong to the intermediate side set and thefirst abutment member 6 belong to the leading end side set are disposed with a phase difference of 40 degrees between thesefirst abutment members 6 as seen along the axial direction of the one rotor shaft. And, thesecond abutment member 7 belonging to the base end side set and thesecond abutment member 7 belonging to the intermediate side set and thesecond abutment member 7 belong to the leading end side set are disposed with a phase difference of 40 degrees between thesesecond abutment members 7 as seen along the axial direction of the other rotor shaft. - Incidentally, the number of the sets of the
first abutment members 6 and thesecond abutment members 7 is not limited to 2 or 3, but may be more. In such case, an arrangement will be made such that thefirst abutment member 6 of each one of the plurality of sets is disposed with an offset in phase as seen in the direction of the one rotor shaft axis by an angle obtained by dividing the angle formed between its projectingportions 6 a peripherally adjacent each other by the number of the sets of thefirst abutment members 6. And, similarly, an arrangement will be made such that thesecond abutment member 7 of each one of the plurality of sets is disposed with an offset in phase as seen in the other rotor shaft axis by an angle obtained by dividing the angle formed between its projectingportions 7 a peripherally adjacent each other by the number of the sets of thesecond abutment members 7. With provision of such large number of sets of thefirst abutment members 6 and thesecond abutment members 7, even a phase difference greater than the predetermined phase difference between the pair of rotor shafts can be prevented in even more reliable manner. - (1) In the foregoing embodiments, there have been described the arrangements wherein a plurality of projecting
portions 6 a are disposed with equal peripheral distance from each other on onerotor shaft 1 a and a plurality of projectingportions 7 a are disposed with equal peripheral distance from each other on theother rotor shaft 1 b. The present invention is not limited thereto. Alternative arrangements may be employed wherein a plurality of projectingportions 6 a are disposed with substantially equal peripheral distance from each other on onerotor shaft 1 a and a plurality of projectingportions 7 a are disposed with substantially equal peripheral distance from each other on theother rotor shaft 1 b. - (2) In the foregoing embodiments, one
proximity sensor 9 a detects the projectingportion 6 a of thefirst abutment member 6 and theother proximity sensor 9 b detects the projectingportion 7 a of thesecond abutment member 7. Instead of this construction, oneproximity sensor 9 a may detect the projectingportion 6 a of thefirst abutment member 6 whereas theother proximity sensor 9 b detects a dog (a detection target element) provided in thesecond abutment member 7. With this arrangement, it becomes possible to match the detection timings of theproximity sensors - (3) In the foregoing embodiments, the projecting
portion 6 a of thefirst abutment member 6 and the projectingportion 7 a of thesecond abutment member 7 are formed like a rectangular plate with a corner thereof removed or in the trapezoidal form. The invention is not limited thereto. Instead, these projecting portions may be provided in the form of a triangle shape having straight lateral sides or a tapered shape having lateral sides thereof comprised of curves such as involutes, etc. - the present invention is useful as a two-shaft extruder having simple construction, yet capable of efficient and effective extrusion.
Claims (6)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008100645A JP5027717B2 (en) | 2008-04-08 | 2008-04-08 | Twin screw extruder |
JP2008-100645 | 2008-04-08 | ||
PCT/JP2008/071418 WO2009125514A1 (en) | 2008-04-08 | 2008-11-26 | Two-shaft extruder |
Publications (2)
Publication Number | Publication Date |
---|---|
US20110091596A1 true US20110091596A1 (en) | 2011-04-21 |
US8905623B2 US8905623B2 (en) | 2014-12-09 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/933,937 Expired - Fee Related US8905623B2 (en) | 2008-04-08 | 2008-11-26 | Two-shaft extruder with screw blade contact preventing mechanism |
Country Status (6)
Country | Link |
---|---|
US (1) | US8905623B2 (en) |
EP (1) | EP2269802B1 (en) |
JP (1) | JP5027717B2 (en) |
KR (1) | KR101527252B1 (en) |
CN (1) | CN101998901B (en) |
WO (1) | WO2009125514A1 (en) |
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US8905623B2 (en) * | 2008-04-08 | 2014-12-09 | Moriyama Company Ltd. | Two-shaft extruder with screw blade contact preventing mechanism |
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US20190061199A1 (en) * | 2017-08-24 | 2019-02-28 | Yen-Ju CHOU | Extrusion equipment adapted for supercritical foaming and mixing |
WO2020177950A1 (en) * | 2019-03-06 | 2020-09-10 | Compagnie Generale Des Etablissements Michelin | Twin-screw mixing and extrusion machine with mobile elements |
US20210187814A1 (en) * | 2018-06-25 | 2021-06-24 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Screw-type extruder |
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RU199031U1 (en) * | 2020-04-20 | 2020-08-07 | Егор Владимирвич Кулигин | MOLDING MIXTURE PREPARATION DEVICE |
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Also Published As
Publication number | Publication date |
---|---|
JP5027717B2 (en) | 2012-09-19 |
EP2269802A1 (en) | 2011-01-05 |
WO2009125514A1 (en) | 2009-10-15 |
EP2269802A4 (en) | 2013-12-18 |
US8905623B2 (en) | 2014-12-09 |
CN101998901A (en) | 2011-03-30 |
KR20110002856A (en) | 2011-01-10 |
KR101527252B1 (en) | 2015-06-16 |
JP2009248486A (en) | 2009-10-29 |
CN101998901B (en) | 2013-10-02 |
EP2269802B1 (en) | 2015-08-12 |
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